1551661006 has 32 divisors (see below), whose sum is σ = 2778209280. Its totient is φ = 635496576.

The previous prime is 1551660947. The next prime is 1551661039. The reversal of 1551661006 is 6001661551.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 593430 + ... + 596038.

It is an arithmetic number, because the mean of its divisors is an integer number (86819040).

Almost surely, 2^1551661006 is an apocalyptic number.

1551661006 is a deficient number, since it is larger than the sum of its proper divisors (1226548274).

1551661006 is a wasteful number, since it uses less digits than its factorization.

1551661006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4488.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 1551661006 is about 39391.1285189952. The cubic root of 1551661006 is about 1157.7077717609.

The spelling of 1551661006 in words is "one billion, five hundred fifty-one million, six hundred sixty-one thousand, six".